/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.hadoop.hive.metastore.columnstats.merge;

import org.apache.hadoop.hive.metastore.api.ColumnStatisticsObj;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class ColumnStatsMerger {
  protected final Logger log = LoggerFactory.getLogger(getClass());

  public void merge(ColumnStatisticsObj aggregateColStats, ColumnStatisticsObj newColStats) {
    log.debug("Merging statistics: [aggregateColStats:{}, newColStats: {}]", aggregateColStats, newColStats);
    doMerge(aggregateColStats, newColStats);
  }

  protected abstract void doMerge(ColumnStatisticsObj aggregateColStats, ColumnStatisticsObj newColStats);
}
